As the United States entered the twenty-first century, old disputes continued to rear their heads. Some revolved around what it meant to be American and the rights to full citizenship. Others arose from religious conservatism and the influence of the Religious Right on American culture and society. Debates over gay and lesbian rights continued, and arguments over abortion became more complex and contentious, as science and technology advanced. The clash between faith and science also influenced attitudes about how the government should respond to climate change, with religious conservatives finding allies among political conservatives who favored business over potentially expensive measures to reduce harmful emissions.